Aastra 470 System Manual page 120

Installation
The number of terminals is the sum of the power requirements of the individual
terminals and the power available on the S bus.
Connection sockets
Fig. 54 RJ45 connection, single socket
Ω
Fig. 55 RJ45 connection, double socket
120 Aastra 470 as of R1.2
syd-0337/1.2 – R1.2 – 11.2011